Subject: Re: ppc elf_map breakage with MAP_FIXED_NOREPLACE

From: Anshuman Khandual <[email-masked]>
Date: Tue, 9 Jan 2018 17:18:38 +0530

On 01/09/2018 03:42 AM, Michael Ellerman wrote:
> Anshuman Khandual <[email-masked]> writes:
> 
>> On 01/07/2018 04:56 PM, Michael Ellerman wrote:
>>> Michal Hocko <[email-masked]> writes:
>>>
>>>> On Sun 07-01-18 12:19:32, Anshuman Khandual wrote:
>>>>> On 01/05/2018 02:16 PM, Michal Hocko wrote:
>>>> [...]
>>>>>> Could you give us more information about the failure please. Debugging
>>>>>> patch from http://lkml.kernel.org/r/[email-masked]
>>>>>> should help to see what is the clashing VMA.
>>>>> Seems like its re-requesting the same mapping again.
>>>> It always seems to be the same mapping which is a bit strange as we
>>>> have multiple binaries here. Are these binaries any special? Does this
>>>> happen to all bianries (except for init which has obviously started
>>>> successfully)? Could you add an additional debugging (at the do_mmap
>>>> layer) to see who is requesting the mapping for the first time?
>>>>
>>>>> [   23.423642] 9148 (sed): Uhuuh, elf segment at 0000000010030000 requested but the memory is mapped already
>>>>> [   23.423706] requested [10030000, 10040000] mapped [10030000, 10040000] 100073 anon
>>>> I also find it a bit unexpected that this is an anonymous mapping
>>>> because the elf loader should always map a file backed one.
>>> Anshuman what machine is this on, and what distro and toolchain is it running?
>>>
>>> I don't see this on any of my machines, so I wonder if this is
>>> toolchain/distro specific.
>>
>> POWER9, RHEL 7.4, gcc (GCC) 4.8.5 20150623, GNU Make 3.82 etc.
> 
> So what does readelf -a of /bin/sed look like?

Please find here.

=================================================================================================
ELF Header:
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  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           PowerPC64
  Version:                           0x1
  Entry point address:               0x10002b70
  Start of program headers:          64 (bytes into file)
  Start of section headers:          135560 (bytes into file)
  Flags:                             0x2, abiv2
  Size of this header:               64 (bytes)
  Size of program headers:           56 (bytes)
  Number of program headers:         10
  Size of section headers:           64 (bytes)
  Number of section headers:         28
  Section header string table index: 27

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Key to Flags:
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  Segment Sections...
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    47: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    48: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    49: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    50: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    51: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    52: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND __gmon_start__
    53: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    54: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    55: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    56: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    57: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND getfilecon
    58: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    59: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    60: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    61: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    62: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    63: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND setfscreatecon
    64: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    65: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    66: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    67: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    68: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    69: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    70: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
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    77: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    78: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    79: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    80: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    81: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    82: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    83: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    84: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND _Jv_RegisterClasses
    85: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    86: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
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    89: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    90: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
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    92: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_registerTMCloneTable
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    94: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    95: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    96: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND getfscreatecon
    97: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    98: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
    99: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   100: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   101: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   102: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   103: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   104: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   105: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   106: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   107: 00000000100306ac     0 NOTYPE  GLOBAL DEFAULT   23 _edata
   108: 00000000100397c8     0 NOTYPE  GLOBAL DEFAULT   24 _end
   109: 0000000010010360     0 FUNC    GLOBAL DEFAULT  UND [email-masked] (2)
   110: 00000000100306ac     0 NOTYPE  GLOBAL DEFAULT   24 __bss_start
   111: 0000000010001dd0     0 FUNC    GLOBAL DEFAULT [<localentry>: 8]    11 _init
   112: 0000000010010370     0 FUNC    GLOBAL DEFAULT [<localentry>: 8]    13 _fini

Histogram for `.gnu.hash' bucket list length (total of 3 buckets):
 Length  Number     % of total  Coverage
      0  0          (  0.0%)
      1  1          ( 33.3%)     16.7%
      2  1          ( 33.3%)     50.0%
      3  1          ( 33.3%)    100.0%

Version symbols section '.gnu.version' contains 113 entries:
 Addr: 00000000100011f6  Offset: 0x0011f6  Link: 5 (.dynsym)
  000:   0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  004:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    0 (*local*)    
  008:   2 (GLIBC_2.17)    0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  00c:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  010:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  014:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  018:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    0 (*local*)    
  01c:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  020:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  024:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  028:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    0 (*local*)       2 (GLIBC_2.17) 
  02c:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  030:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  034:   0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  038:   2 (GLIBC_2.17)    0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  03c:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    0 (*local*)    
  040:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  044:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  048:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  04c:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  050:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  054:   0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  058:   0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  05c:   0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  060:   0 (*local*)       2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  064:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17) 
  068:   2 (GLIBC_2.17)    2 (GLIBC_2.17)    2 (GLIBC_2.17)    1 (*global*)   
  06c:   1 (*global*)      2 (GLIBC_2.17)    1 (*global*)      1 (*global*)   
  070:   1 (*global*)   

Version needs section '.gnu.version_r' contains 1 entries:
 Addr: 0x00000000100012d8  Offset: 0x0012d8  Link: 6 (.dynstr)
  000000: Version: 1  File: libc.so.6  Cnt: 1
  0x0010:   Name: GLIBC_2.17  Flags: none  Version: 2

Displaying notes found at file offset 0x00000284 with length 0x00000020:
  Owner                 Data size	Description
  GNU                  0x00000010	NT_GNU_ABI_TAG (ABI version tag)
    OS: Linux, ABI: 2.6.32

Displaying notes found at file offset 0x000002a4 with length 0x00000024:
  Owner                 Data size	Description
  GNU                  0x00000014	NT_GNU_BUILD_ID (unique build ID bitstring)
    Build ID: a6c7b5f6f5cf4174f94bc7568ca07cfd81ee4443
=================================================================================================

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